// Updates the nearby button's text to be the number of devices found. If no devices have been
// found, the text is set to "Nearby".
private void updateNearbyButton() {
int count = mDeviceManager.getAdapter().getCount();
final String text =
(count == 0 ? "" : (String.valueOf(count) + " "))
+ getResources().getString(R.string.map_nearby_button);
if (mNearbyButton != null) {
mNearbyButton.setText(text);
mNearbyButton.setSelected(count > 0);
}
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
private boolean initNearby() {
PackageManager pm = getPackageManager();
if (pm != null && pm.hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
BluetoothManager manager = (BluetoothManager) getSystemService(BLUETOOTH_SERVICE);
BluetoothAdapter adapter = manager.getAdapter();
if (adapter != null) {
MetadataResolver.initialize(this);
mDeviceManager = new NearbyDeviceManager(this, adapter);
mDeviceManager
.getAdapter()
.registerDataSetObserver(
new DataSetObserver() {
@Override
public void onChanged() {
updateNearbyButton();
}
});
return true;
}
}
return false;
}